Has the issue commented on here, http://www.cocos2d-x.org/news/24 , been resolved in some way?
I understand this is not a bug with cocos2d-x rather some bug in the platform; however, if this is still happening it means you can’t use any 3D effects if you are targeting iPad and don’t want rendering artifacts. I believe that I have seen my cocos2d-x game exhibit a similar issue on an iPad 2 running iOS6 so iOS version doesn’t seem to fix it.